A head includes a transducer and a slider having an air bearing surface (ABS) and a trailing face. The slider has an overcoat layer that includes the trailing face and that overcoats the transducer. The ABS includes a trailing pad having a major surface adjacent the transducer, with the major surface lying in a primary plane. The ABS also includes a sub-ambient pressure cavity disposed upstream of the overcoat layer and being recessed from the primary plane by a cavity depth in the range 0.8 to 2 microns. The overcoat layer includes a trailing air flow dam being recessed from the primary plane by a step depth in the range 0.05 to 0.5 microns. The overcoat layer also includes a corner region recessed from the primary plane by at least the cavity depth.
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1. A head comprising:
a slider having a leading face and a trailing face and an air bearing surface, the air bearing surface defining an upstream direction pointing from the trailing face to the leading face; and
a transducer;
the slider also having an overcoat layer, the overcoat layer including the trailing face and overcoating the transducer;
wherein the air bearing surface includes:
a trailing pad including a major surface adjacent the transducer, the major surface lying in a primary plane;
a sub-ambient pressure cavity disposed upstream of the overcoat layer and being recessed from the primary plane by a cavity depth in the range 0.8 to 2 microns; and
wherein the overcoat layer includes:
a trailing air flow dam being recessed from the primary plane by a step depth in the range 0.05 to 0.5 microns, and
a corner region recessed from the primary plane by at least the cavity depth.
3. The head of
5. The head of
6. The head of
7. The head of
8. The head of
9. The head of
10. The head of
11. The head of
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This application is a continuation in part of U.S. application Ser. No. 11/787,515 entitled “HEAD WITH AN AIR BEARING SURFACE HAVING A SHALLOW RECESSED TRAILING AIR FLOW DAM,” filed on Apr. 17, 2007.
The present invention relates generally to the field of information storage devices, and more particularly to air bearing sliders used in such devices.
Information storage devices are used to retrieve and/or store data in computers and other consumer electronics devices. A magnetic hard disk drive is an example of an information storage device that includes one or more heads that can both read and write, but other information storage devices also include heads—sometimes including heads that cannot write.
The typical hard disk drive includes a head disk assembly (HDA) and a printed circuit board (PCB) attached to a disk drive base of the HDA. Referring now to
During operation of the disk drive, the actuator must rotate to position the heads adjacent desired information tracks on the disk. The actuator includes a pivot bearing cartridge 112 to facilitate such rotational positioning. One or more actuator arms extend from the actuator body. An actuator coil 114 is supported by the actuator body opposite the actuator arms. The actuator coil is configured to interact with one or more fixed magnets in the HDA, typically a pair, to form a voice coil motor. The printed circuit board assembly provides and controls an electrical current that passes through the actuator coil and results in a torque being applied to the actuator. A crash stop is typically provided to limit rotation of the actuator in a given direction, and a latch is typically provided to prevent rotation of the actuator when the disk drive is not in use.
In a magnetic hard disk drive, the head typically comprises a body called a “slider” that carries a magnetic transducer on its trailing end. The magnetic transducer typically comprises a writer and a read element. The magnetic transducer's writer may be of a longitudinal or perpendicular design, and the read element of the magnetic transducer may be inductive or magnetoresistive. In a magnetic hard disk drive, the transducer is typically supported in very close proximity to the magnetic disk by a hydrodynamic air bearing. As the motor rotates the magnetic disk, the hydrodynamic air bearing is formed between an air bearing surface of the slider of the head, and a surface of the magnetic disk. The thickness of the air bearing at the location of the transducer is commonly referred to as “flying height.”
Magnetic hard disk drives are not the only type of information storage devices that have utilized air bearing sliders. For example, air bearing sliders have also been used in optical information storage devices to position a mirror and an objective lens for focusing laser light on the surface of disk media that is not necessarily magnetic.
The flying height is a key parameter that affects the performance of an information storage device. Accordingly, the nominal flying height is typically chosen as a careful compromise between each extreme in a classic engineering “trade-off.” If the flying height is too high, the ability of the transducer to write and/or read information to/from the disk surface is degraded. Therefore, reductions in flying height can facilitate desirable increases in the areal density of data stored on a disk surface. However, the air bearing between the slider and the disk surface can not be eliminated entirely because the air bearing serves to reduce friction and wear (between the slider and the disk surface) to an acceptable level. Excessive reduction in the nominal flying height degrades the tribological performance of the disk drive to the point where the disk drive's lifetime and reliability become unacceptable.
Another factor that can adversely affect the tribological performance of the head, and therefore also adversely affect the disk drive's lifetime and reliability, is the extent to which lubricant and other debris are picked up or accumulated on the air bearing surface during operation. Excessive accumulation of lubricant or other debris on the air bearing surface can undesirably change the flying characteristics of the slider, potentially leading to immediate reading or writing errors, head crash, or future tribological failure, and/or redeposit on the disk surface at a location or in a quantity that leads to similar problems. To reduce accumulation of lubricant on the air bearing surface disk drive tribologists have been constrained in their choice of lubricants, for example having to opt for a lubricant with less mobile component than would otherwise be desirable. Accordingly, what is needed in the art is an air bearing design that discourages excessive accumulation of lubricant or other debris on the air bearing surface.
A novel head is disclosed and claimed. The head includes a transducer and a slider having a leading face, a trailing face, and an air bearing surface. The slider has an overcoat layer that includes the trailing face and that overcoats the transducer. The air bearing surface defines an upstream direction pointing from the trailing face to the leading face. The air bearing surface includes a trailing pad having a major surface adjacent the transducer, with the major surface lying in a primary plane. The air bearing surface also includes a sub-ambient pressure cavity disposed upstream of the overcoat layer and being recessed from the primary plane by a cavity depth in the range 0.8 to 2 microns. The overcoat layer includes a trailing air flow dam being recessed from the primary plane by a step depth in the range 0.05 to 0.5 microns. The overcoat layer also includes a corner region recessed from the primary plane by at least the cavity depth.
Now referring to
Head 200 also comprises a slider 204, which is typically fabricated from a ceramic material such as alumina titanium carbide. Slider 204 includes an air bearing surface 206, which may be formed on the surface of slider 204 by etching or ion milling and has a geometry that may be defined by use of a mask. The slider 204 has an overcoat layer 236 that includes a trailing face 208 and includes a transducer region 203 that overcoats the transducer 202. The slider 204 also includes a leading face 210.
In the exemplary embodiment shown in
In the exemplary embodiment shown in
For each upstream direction, the air bearing surface 206 defines a lateral axis that is perpendicular to that upstream direction. For example, for a zero-skew upstream direction 230 that is parallel to the air bearing surface 206 and parallel to the plane of cross-section AA depicted in
The two leading pads 212, 214 may be separated by shallow cavities 220 and 222, respectively, and shallow cavities 220 and 222 may themselves be separated by a longitudinal divider 217.
Now referring additionally to
In the exemplary embodiment shown in
Also in the exemplary embodiment of
In the exemplary embodiment of
In the embodiment of
Trailing pad side portions 246 and 248 can enhance the performance of the pressurizing step surface 250 by partially confining the airflow to pressurize the trailing pad 256. In the embodiment of
In the embodiment of
In the embodiment of
In the embodiment of
In the embodiment of
In the embodiment of
In the embodiment of
In the embodiment of
Now referring to
In the exemplary embodiment shown in
In the exemplary embodiment shown in
In the exemplary embodiment shown in
In the exemplary embodiment of
In the embodiment of
In the embodiment of
In the embodiment of
In the embodiment of
In the embodiment of
In the embodiment of
In the embodiment of
Now referring to
In the exemplary embodiment shown in
In the exemplary embodiment shown in
Now referring additionally to
In the exemplary embodiment shown in
Also in the exemplary embodiment of
In the embodiment of
In the embodiment of
In the embodiment of
In the embodiment of
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In the embodiment of
In the foregoing specification, the invention is described with reference to specific exemplary embodiments thereof, but those skilled in the art will recognize that the invention is not limited thereto. It is contemplated that various features and aspects of the above-described invention may be used individually or jointly and possibly in an environment or application beyond those described herein. The specification and drawings are, accordingly, to be regarded as illustrative and exemplary rather than restrictive. The terms “comprising,” “including,” and “having,” as used herein are intended to be read as open-ended terms.
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